package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    /**
     * 发送验证码
     * @param phone
     * @param session
     * @return
     */
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2.不符合，提示错误信息
            return Result.fail("手机号格式错误！");
        }
        //3.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4.保存验证码到redis
        stringRedisTemplate.opsForValue().set( LOGIN_CODE_KEY +phone,code,LOGIN_CODE_TTL,TimeUnit.MINUTES);
        //5.发送验证码
        log.info("发送验证码成功，验证码为：{}",code);
        return Result.ok();
    }

    /**
     * 登录
     * @param loginForm
     * @param session
     * @return
     */
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误！");
        }
        //2.校验验证码
        String catchCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        if (catchCode == null||!catchCode.equals(loginForm.getCode())) {
            //3.不一致，报错
            return Result.fail("验证码有误");
        }
        //4.一致，根据手机号查用户
        User user = query().eq("phone", phone).one();
        //5.判断用户是否存在
        if (user == null) {
            //6.不存在，创建新用户
           user = createUserWithPhone(phone);
        }
        //7.保存用户到redis中
        //7.1随机生成一个token，作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //7.2将user对象转换成hashmap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> stringObjectMap = BeanUtil.beanToMap(userDTO,new HashMap<>(), CopyOptions.create()
                .setIgnoreNullValue(true)
                .setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));
        //7.3存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,stringObjectMap);
        //7.4设置token有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.MINUTES);
        //8返回token
        return Result.ok(token);
    }
    @Override
    public Result logout(HttpServletRequest request) {
//1.获取用户昵称
        String name = UserHolder.getUser().getNickName();
// 2.获取日期
        LocalDateTime now = LocalDateTime.now();
//3.获取请求头中的token
        String token = request.getHeader("authorization");
//4.拼接对应redis中token的位置login:token:xxxxx
        String tokenKey = LOGIN_USER_KEY + token;
//4.删除redis中的token
        stringRedisTemplate.delete(tokenKey);
        log.info(now + "用户:{" + name + "} 退出成功!");
        UserHolder.removeUser();
        return Result.ok();
    }
    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
